That's exactly how I feel! It totally creeps me out! He doesn't do this to my sister, only me, so it gets me a little nervous. I don't know what he's trying to do but it seems like he's getting some sort of gratification exposing himself to a girl. I don't want to be part of his gratification, that's just messed up, but I don't know what to do about it.

I don't really want to get him in trouble if this is just a passing thing, but if it gets too out of hand I'll have to. I guess I could talk to him myself but I honestly feel afraid to bring it up to him directly.

My brother is two years younger and it's been a few years since we stopped being naked in front of each other, but his penis is probably the last thing that will turn me on. I get more turned on by hot looking guys and when I fantasize about having sex with them, I obviously then imagine what their hard penis would look and feel like.